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Operation Scan Pyramids scientists said: "We are now able to confirm the existence of a 'void' hidden behind the north face, that could have the form of at least one corridor going inside the Great Pyramid."

Another 'cavity' was discovered on the pyramid's northeast flank but there is currently no link between the two cavities, according to Mehdi Tayoubi, founder of the Heritage Innovation Preservation Institute (HIP).

He told Seeker: "Such void is shaped like a corridor and could go up inside the pyramid."

The international Scan Pyramids team is lead by the Faculty of Engineering at Cairo University, and the Paris-based HIP Institute.

"Judiciously placed detectors - for example inside a pyramid, below a potential, unknown chamber - can then record particle tracks and discern cavities from denser regions."

In May scientists from the project released images and details of what they found at the Bent Pyramid, located at the royal necropolis of Dahshur.

They uncovered two entrances, one on the north side and one on the west side.

They open onto two corridors, which in turn lead to a pair of burial chambers, one on top of the other.

It is the the earliest to be built under the Old Kingdom Pharaoh Sneferu and thought to be the first attempt at a smooth sided structure.

It had been thought the body of Pharaoh Sneferu was entombed inside the pyramid.

However the scans scotched that theory - with no suitable chamber found inside the monument.

But Mehdi Tayoubi, president of the Heritage Innovation Preservation Institute, told Discovery: "Nevertheless, this is indeed a scientific breakthrough as it validates the muography principle applied to Egyptian pyramids.